Reamer attachment for die-stocks.



D. HITCHCOCK.

REAMER ATTACHMENT FOR DIE STOCKS.

APPLICATION FILED 0Ec.22. 1914.

1,156,290, Patented Oct. 12, 1915.

i 4 K i W T all whom it may concern Be it known that I, DELBERTHlroncook,

' a citizen of the United States, residing at St. Paul, in the countyofRamsey and State of Minnesota, have invented a new and usefulImprovement in Reamer Attachments for Die-Stocks, of which the followingis a specification. I

This invention relates to' a reamer attachment for die stocks, theprimary object thereof being to provide a device, which is readily andquickly adjustable to different sizes of pipes, whereby the pipes may bethreaded, and the burs resulting from cutting, reamed out and removed ina single operation. In a device of this general character it has beenfound in practice, that the reamer must be held with its cutting edgesagainst the inner edge of the end of the pipe which is being threaded,so that it willnot engage too abiuptly and bite into the pipe,causing'either the reamer to break or the end of the pipe to be cutunevenly or too deeply. This objection I have overcome by providing areamer attachment, which holds the reamer to its work under springpressure and which is readilyadjustable to different kinds of work, andto different sizes of reamers which are employed. 1

A further object of the invention is to provide a reamer attachment,which can be mounted upon the die stock and made to hold the plate,which fastens the thread cutting elements in the stock, in place of thescrews, which are ordinarily employed for fastening said plate inposition.

A still further object is to provide an attachment of the characterstated, which will adjustably hold the reamer, so that 'it can beproperly centered in the end of the pipe to be reamed.

To these ends my invention, comprises the features of construction, andcombination of parts, which will be hereinafter more particularlydescribed and set forth in the claims.

In the drawing, Figure 1 is a side elevat1on partly in section of anembodiment of my invention, a detail portion of a die stock being shown;Fig. 2 is a plan of the construction illustrated in Fig. 1, and Fig. 3is a plan of a detail.

In the drawing, A indicates a portion of a die stock, having the usualhandles 2 and 3 secured in the usual socket pieces, which are formedintegral with the body 4 of the DELBERT HITCHCOCK, OF ST. PAUIII,MINNESOTiL.

Specification of Letters Patent.

BEAMER A TACHMENT For. DIE-STOCKS.-

Patented Got. 12. 1915..

Application filed December 22, 1914. Serial No. 878,478.

stock. The-body 4 has the usual recess or chamber .5, in which thethread cutting elements 6 are held in the usual manner by a cover plate7. This cover plate ordinarily.

is fastened .by screws not shown passing through openings 8 in theplate, and entermg threaded openings 9 in the body. Said screws areremoved when it is desired to secure my improved attachment B to the diestock. In use the stock is applied to the end of a pipe, such as 10 tobe threaded, said stock having its throat 11 passing over the pipeduring the operation of cutting the thread. 4

My improved attachment consists of a downwardly against the plate 7, andhold thelatter firmly with thethread cutting I elements 6 engaged withinthechamber 5. 'lhe guide arms 12 and 13 are parallel and extendoutwardly in the same general direction from the body, suitable handles16 being formed on their outer endsby which they'can be easily andquickly turned for attachment to or detachment from the die stock.Mounted upon the guides'12 and 13 is a yoke frame 17, having two sleeveportions 1.8, slidably mounted over the guides. The

bridge portion 17 of the yoke is formed 'Wlth a socket 19 in which thesquare shank 20 of the reamer such as 21 is received. The upper andlower faces 22 and 23 of the bridge adjacent the socket have securedthereto adjustable plates 24 and 25, each of which is formed with anopening 26, said opening being adapted to receive and hold the shank 2Osnugly. These plates are fastened to the bridge by screws such as 27,slots such as 28 being formed in the plates, so that the plates can beadjusted and held in selected position to vary the angle at which thereamer is held by the reamer support or yoke. The slots 28 in the plate24 are disposed at right angles to the slots spring pressure by means ofthe compression 7,

springs 29, which are placed over the guides with their lower endspressing against the upper ends of the sleeve portions 18 of the yoke,and their upper ends held under compression below the adjusting nuts 30,which are threaded upon the guides. Thus by varying the compression ofthe springs 29, the force with which the cutting edges of the reamer arepressed into engagement with the pipe to be reamed is adjusted. Theadjustment of the nuts 30 also varies the time when the reamer is madeto engage and perform its work, it being necessary to vary this time ofengagement according to the sizes of reamers employed, and the kinds ofmaterial which are being threaded and reamed. In use the guides aresecured to the body 4 over the plate 7. After the reamer such as 21 isplaced with its shank in engagement with the plates 24 and 25 on thereamer support, the nuts are then adj usted as desired, and the diestock employed to cut threads on pipes in the usual manner. It is notnecessary to pay any particular attention to the reaming operation, 'asthe reamer will automatically during the threading of a pipe, performitsfunction in an efficient and effective manner;

In accordance with. the patent statutes, I have described the principlesof operation of my invention, together with the apparatus which I nowconsider to represent the best embodiment thereof, but I desire to haveit understood that the construction shown is only illustrative and thatthe invention can be carried out by other means and applied to usesother than those above set forth within the scope of the followingclaims.

Having described my invention, what I waaeo claim as new and desire toprotect by Letters Patent is 1. In combination with a die stock, areamer, a holder for said reamer having a socket to receive and hold theshank of the reamer in Working position and a pair of sleeves near theextremities of said yoke, a pair of guide arms upon which said sleevesare slidably mounted, said arms being secured by their ends to the bodyof the die stock, compression springs on said guides pressing downwardlyagainst said sleeves on said yoke and means for adjustably compressingsaid springs on said guides to vary the pressure at which the reamer ispressed by the yoke into engagement with its work.

2. In combination with a die stock and a reamer, a yoke frame havingguide sleeves upon its ends and an opening between its ends into whichthe shank of said reamer is received freely, plates mounted upon saidframe having openings to receive and hold the shank of said reamer, saidplates being movably supported upon said frame so that their positionsmay be varied to change the angle .at which said reamer is supported,guides mounted upon said die stock upon which said sleeves are slidably,mounted, compression springs on said guide rods pressing downwardly uponsaid frame to force said reamer into engagement with its work and meanson said guides for chang ing the compression of said springs.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

DELBER'I HITCHCOCK.

Witnesses:

STELLA L. WASOHENBERGER, F. G. BRADBURY.

